Translation of a scene node

[sunil.nair]

Hi, I am new to QT. I am trying to move an object from one point to another in this function. But, rather than translating the object, QT creates a copy of the cube. How can I use translation.
@
CubeView::CubeView(QWindow *parent)
: QGLView(parent)
{
//! [1]
QGLBuilder builder1;
builder1 << QGL::Faceted;
builder1 << QGLCube(1);
cube = builder1.finalizedSceneNode();

QGLBuilder cursor_builder;
cursor_builder <<QGL::Faceted;
cursor_builder <<QGLCube(1);
cursor=cursor_builder.finalizedSceneNode();

//camera setup
camera()->setFieldOfView(35);
camera()->setNearPlane(1);
camera()->setFarPlane(10);

//! [2]
logo.setImage(QImage(QLatin1String(":/blackcircle.jpg")));
//initialize Haptics
initHaptics();
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(update()));
timer->start(500);

}
//! [2]
void CubeView::update()
{
//QGLPainter *paint= new QGLPainter;
cube->setPosition(p2);
std::cout<<"Hello \n";
//paintGL(paint);
}
@
Instead of moving the cube, QT creates another copy of the cube. Could you suggest something? Thanks.